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+\documentclass{minimal}
+\usepackage{pstricks}
+\usepackage{pst-plot}
+\usepackage{multido}
+\usepackage{pst-xkey}
+
+\makeatletter
+\pst@addfams{user}
+\define@key[psset]{user}{nLoop}{\def\psnLoop{#1}}
+\psset[user]{nLoop=1}
+\makeatother
+\def\chooseColor#1{%
+ \ifcase#1\or red\or green\or blue\or cyan\or magenta\or gray\fi}
+
+\parindent=0pt
+\pagestyle{empty}
+\begin{document}
+
+\psset{xunit=1.5mm,yunit=3mm}
+\begin{pspicture}(-45,0)(45,20)
+ \psaxes[Dy=10,Dx=15]{->}(0,0)(-45,0)(45,20)%
+ \psset{linewidth=1pt}%
+ \pstVerb{%
+ /dc 0.2 def
+ /kx 12 def
+ /ky 12 def
+ /pi 3.141529 def
+ /rad2deg { 57.296 mul } def
+ /si { pi mul dup rad2deg sin exch div } def
+ /Func {
+ /nLoop exch def
+ x kx mul nLoop mul cos
+ nLoop dc mul si mul
+ } def
+ }%
+ \psset{plotpoints=400,linecolor=red,plotstyle=curve}%
+ \multido{\iA=1+1}{6}{%
+ \psplot[linecolor=\chooseColor\iA,nLoop=\iA]{-45}{45}{%
+ /y0 x kx mul cos dc si mul def
+ /y1 0 def
+ 1 1 \psnLoop {
+ Func y1 add /y1 exch def
+ } for
+ y1 y0 add
+ dc mul 2 mul
+ dc add
+ ky mul
+ }%
+ }%
+\end{pspicture}
+
+\end{document}
+